Math Basics: Area of a Rectangle

One of the most frequently encountered shapes in the world is the rectangle. No wonder, questions on rectangles are also pretty common on standardized tests. In order to tackle the more advanced questions on geometrical shapes, it is always important to know the basics. In this post, we will look at the simple concept of the area of a rectangle.

To understand the concept of area, think of it as a measurement. An area of a rectangular room will give you a sense of the size of the room. Area is two-dimensional and is always represented in square units.

Now, in order to find out the area of a rectangle, all you have to do is multiply a rectangle’s length by its width.

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A = L*W, where L stands for length and W stands for width.

For example, if the length of a rectangle is 5 cm and the width is 3 cm, the area of the rectangle would be 5*3=15 cm2.

The same formula can be applied to a square since a square is nothing but a rectangle with equal sides. The area of a square with each side measuring 5 cm is 5*5=25 cm2.

Even if you are given the area of a rectangle and one of the sides, you can easily find out the dimension of the other side. An example would best illustrate this:

You have a rectangle with an area of 35 cm2 and width as 5 cm. What is the length? Applying the formula stated above with L as the missing element:
L*5=35

or L=35/5=7

So, the length of the side is 7 cm.
Similarly for a square whose area is 49 cm2, we can find out its side n by

n*n=49

or n=7 cm.
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